...If the boards could be removed from the frame, a close examination of the edges would be interesting. If any paint is on the thin side edges, then they could NOT have been cut, after the painting. BUT, if the paint on the flat surface goes completely to all edges, but there is NO incidental paint on the sides, it seems to me to strongly indicate they were cut, AFTER painting...

OK, curiosity got the better of me. There is no incidential paint on the side edges. And based on the rather uneven edges, it does appear the board was crudely cut AFTER painting...